JPH01218A - Metal surface remelting treatment method - Google Patents
Metal surface remelting treatment methodInfo
- Publication number
- JPH01218A JPH01218A JP62-155196A JP15519687A JPH01218A JP H01218 A JPH01218 A JP H01218A JP 15519687 A JP15519687 A JP 15519687A JP H01218 A JPH01218 A JP H01218A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- protrusion
- metal
- remelting
- crater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 32
- 229910052751 metal Inorganic materials 0.000 title claims description 21
- 239000002184 metal Substances 0.000 title claims description 21
- 239000000463 material Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000002344 surface layer Substances 0.000 claims description 10
- 238000007712 rapid solidification Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 8
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000011324 bead Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000010128 melt processing Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
この発明はアルミニウム合金鋳物などの各種金属材料か
らなる自動車部品や各種機械部品などにおいて、その一
部の表面層を局部的に改質するための再溶融処理方法に
関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention is a recycling method for locally modifying the surface layer of automobile parts and various mechanical parts made of various metal materials such as aluminum alloy castings. The present invention relates to a melt processing method.
従来の技術
最近に至り、アルミニウム合金などの金属材料からなる
部品、特に鋳物部品の表面の一部の特性を局部的に向上
させるための再溶融処理が注目を浴びている。この再溶
融処理は、ＴＩＧアークやレーザビーム、あるいは電子
ビーム、プラズマアークなどの高密度加熱エネルギを金
属材料の表面に照射してその表面層を再溶融させ、引続
く急冷凝固によって引は巣やピンホール、ブローホール
などの鋳造欠陥を除去するとともに金属組織を微細化さ
せて、表面層の特性向上を図るものである。BACKGROUND ART Recently, remelting treatment for locally improving the characteristics of a part of the surface of parts made of metal materials such as aluminum alloys, particularly cast parts, has been attracting attention. This remelting process involves irradiating the surface of the metal material with high-density heating energy such as a TIG arc, laser beam, electron beam, or plasma arc to remelt the surface layer, and then rapidly solidify the material to remove any cavities. This method aims to improve the characteristics of the surface layer by removing casting defects such as pinholes and blowholes and by refining the metal structure.
このような再溶融処理を特にアルミニウム合金鋳物から
なる自動車用エンジンのシリンダヘッドに適用した例と
しては、本出願人の出願に係る特開昭６１−１９３７７
３号記載の方法がある。この方法は、アルミニウム合金
鋳物ではピンホールやブローホール、引は巣等の鋳造欠
陥が生じ易いこと、またシリンダヘッドは大型で？！ｌ
な形状を要するため鋳造時の冷却速度が遅くなって金属
組織が粗大化し易いこと、一方シリンダヘッドのうちで
も特に排気ボートと吸気ボートとによって挟まれるいわ
ゆる弁間部に大きな熱応力が加えられることから、その
弁間部に機械的特性が優れていることが要求されること
、等を背景としてなされたものであり、アルミニウム合
金鋳物からなるシリンダヘッドの弁間部にＴＩＧアーク
等の高密度エネルギを印加して再溶融・急冷再凝固させ
、弁間部の鋳造欠陥を除去するとともに弁間部の組織の
微細化を図り、弁間部の機械的特性、特に熱応力に対す
る特性を向上させている。An example of applying such remelting treatment to a cylinder head of an automobile engine made of an aluminum alloy casting is disclosed in Japanese Patent Laid-Open No. 61-19377 filed by the present applicant.
There is a method described in No. 3. This method is useful because aluminum alloy castings tend to have casting defects such as pinholes, blowholes, and cavities, and because the cylinder head is large. ! l
This requires a large shape, which slows down the cooling rate during casting and tends to coarsen the metal structure.On the other hand, large thermal stress is applied to the so-called valve space in the cylinder head, which is sandwiched between the exhaust boat and the intake boat. This was done against the background of the need for excellent mechanical properties in the valve gap area, and high-density energy such as TIG arc is applied to the valve gap area of the cylinder head made of aluminum alloy casting. By applying a There is.
発明が解決すべき問題点
前述のような再溶融処理は、一般には第４図（Ａ＞、（
Ｂ）に示すように、処理すべき金属基材１の表面にＴＩ
Ｇアーク用トーチ２などによってＴＩＧアーク等の高密
度加熱エネルギ３を印加しつつ、その印加位置を処理す
べき領域４の一端４Ａから他端４Ｂへ向けて連続移動さ
せ、その移動線＠（処理終端＞４Ｂ付近において高密度
加熱エネルギ３の印加を停止させるのが通常である。Problems to be Solved by the Invention Generally, the above-mentioned remelting process is performed as shown in Fig. 4 (A>, (
As shown in B), TI is applied to the surface of the metal substrate 1 to be treated.
While applying high-density heating energy 3 such as a TIG arc using a G-arc torch 2 or the like, the application position is continuously moved from one end 4A to the other end 4B of the region 4 to be processed, and the movement line @(processing It is normal to stop applying the high-density heating energy 3 near the end>4B.
ところがこの場合、処理された部分、すなわち再溶融−
再凝固によって形成された再凝固層（ど−ド）９の終端
部では表面に凹部、すなわち所謂クレータ６が生じるの
が通常である。もちろん再溶Ｆａ処理後には、処理部位
の表面を平滑化するため、研削による仕上加工を行なう
のが通常であるが、仕上加工の削り代は工程上あるいは
経済的な制約を受けるから、クレータ６の深さが深い場
合には第４図（Ｃ）に示すように仕上加工後もその仕上
加工面１Ａにクレータ６が残り、外観不良をもたらすこ
とが多い。またこのようなりレータ６が残った状態では
、そのクレータ６の内部は凹凸が激しいため、単に外観
不良をもたらすのみならず、クレータ６の内部の凹凸に
よりその部分に応力集中が生じたりして、疲労特性や衝
撃特性等の特性低下をもたらすおそれもある。However, in this case, the treated part, that is, the remelted
At the end of the resolidified layer (doad) 9 formed by resolidification, a recess, that is, a so-called crater 6, is usually formed on the surface. Of course, after the remelted Fa treatment, finishing processing by grinding is usually performed to smooth the surface of the treated area, but since the cutting allowance for finishing processing is subject to process or economic constraints, crater 6 If the depth is deep, craters 6 remain on the finished surface 1A even after finishing, as shown in FIG. 4(C), often resulting in poor appearance. In addition, in such a state where the crater 6 remains, the inside of the crater 6 is extremely uneven, which not only causes a poor appearance, but also causes stress concentration in that part due to the unevenness inside the crater 6. There is also a risk of deterioration of properties such as fatigue properties and impact properties.
なお一般の溶加棒を用いた溶接ビードでは、溶接終了間
際に溶加棒を若干多めに挿入して溶接ビード終端部での
クレータの発生を防いでいるが、再溶＠処理では溶加棒
を用いないためクレータの発生を防止することは困難で
あった。また再溶融処理において処理終了間際に徐々に
アーク電流を下げることによってクレータをある程度は
浅くすることができるが、完全に解消することはできず
、前述のような問題を招かざるを得なかったのが実情で
ある。In addition, in a weld bead using a general filler rod, the filler rod is inserted a little more just before the end of welding to prevent craters from forming at the end of the weld bead, but in the re-melting process, the filler rod is It was difficult to prevent the formation of craters because the method was not used. In addition, although it is possible to make the crater shallower to some extent by gradually lowering the arc current near the end of the remelting process, it cannot be completely eliminated and the above-mentioned problems have no choice but to occur. is the reality.
この発明は以上の事情を背景としてなされたもので、再
溶ａ！処理ビードの終端部のクレータによる前述のよう
な問題を招かないようにした再溶融処理方法を提供する
ことを目的とするものである。This invention was made against the background of the above-mentioned circumstances. It is an object of the present invention to provide a remelting treatment method that does not cause the above-mentioned problems due to craters at the end portions of treated beads.
問題点を解決するための手段
この発明は、金属基材表面に高密度加熱エネルギを印加
してその表面層を再溶融させ、引続く急冷凝固により表
面層を改質させる金属表面の再溶ａ！処理方法において
、高ｖ！ｉ度加熱エネルギの印加位置を金属基材表面の
ある領域にわたって連続的に移動させてその領域を処理
するにあたり＝ｆｆｉ理終端部となるべき部分の金属基
材表面に予め突起部を形成しておき、その突起部の位置
で処理を終了させることを特徴とするものである。Means for Solving the Problems This invention is a method of remelting a metal surface by applying high-density heating energy to the surface of a metal substrate to remelt the surface layer, and subsequently modifying the surface layer by rapid solidification. ! In the processing method, high v! When the application position of heating energy is continuously moved over a certain area of the surface of the metal base material to treat that area, a protrusion is formed in advance on the surface of the metal base material at the part that should be the end of the process. The process is then terminated at the position of the protrusion.
作 用
第１図（Ａ）〜（Ｄ）に高密度加熱エネルギとしてＴＩ
Ｇアークを用いてこの発明の再溶融処理方法を実施して
いる状況の一例を模式的に示し、これらの図に従ってこ
の発明の詳細な説明する。Action Figures 1 (A) to (D) show TI as high-density heating energy.
An example of a situation in which the remelting treatment method of the present invention is implemented using a G arc is schematically shown, and the present invention will be described in detail with reference to these figures.
この発明の方法を寅臆するにあたっては、再溶融処理を
行なうに先立って、第１図（Ａ＞に示すように金属基材
１の表面のうち、処理すべ′き領域４の終端部４Ｂに予
め台状の突起部７を形成しておく。そして第１図（Ｂ）
に示すようにＴＩＧアーク用トーチ２を前記領域４の一
端（始端部）４Ａの上方の位置から他端（終端部）４Ｂ
の上方の位置まで連続的に移動させることによって、ト
ーチ２と金属基材１の表面との間に発生しているアーク
３の位置、すなわち高密度加熱エネルギの印加位置を領
域４の一端４Ａから他端４Ｂまで連続的に移動させる。In testing the method of the present invention, prior to performing the remelting treatment, as shown in FIG. A table-shaped protrusion 7 is formed in advance. Then, as shown in FIG. 1(B)
As shown in FIG.
By continuously moving the torch 2 to the upper position, the position of the arc 3 generated between the torch 2 and the surface of the metal base material 1, that is, the application position of high-density heating energy, can be changed from one end 4A of the area 4. Continuously move to the other end 4B.
この間、領域４内の金属基材表面層がアーク３によって
急速溶融され、かつその溶融プール８はアーク３の移動
によって逐次急速冷却され、再凝固！１９となる。この
とき、再凝固は母材側から表面へ向けて方向性をもって
なされ、その結果金属基材表面層に存在していた引は巣
や、ピンホール、ブローホール等の鋳造欠陥が表面側へ
押し出される状態で消滅し、これらの鋳造欠陥のない健
全な組織の再凝固層９が形成され、しかも急速凝固によ
って再凝固組織は箸しく微細化され、その結果再凝固層
９の機械的特性は処理前の状態よりも大幅に向上される
。During this time, the surface layer of the metal base material in the region 4 is rapidly melted by the arc 3, and the molten pool 8 is successively rapidly cooled by the movement of the arc 3, and re-solidifies! It will be 19. At this time, resolidification is performed in a direction from the base metal side to the surface, and as a result, casting defects such as cavities, pinholes, blowholes, etc. that existed on the surface layer of the metal base material are pushed out to the surface side. A resolidified layer 9 with a healthy structure free from these casting defects is formed, and the resolidified structure is made extremely fine due to rapid solidification, and as a result, the mechanical properties of the resolidified layer 9 are improved by the processing. Significantly improved over the previous state.
そして特にこの発明の方法では、領域４の一端４Ａから
開始させた高密度加熱エネルギの印加を領域４の他端４
Ｂ、すなわち突起部７の位置にて終了させる。この際第
１図（Ｃ）に示すように処理終了位置ではクレータ６が
生じるが、その部分は予め突起部７が形成されているか
ら、クレータ６の最も深い部分も、金属基材１の本来の
表面レベル１Ｂよりも浅いか、または仮に金属基材表面
レベル１Ｂよりも深いとしてもその基材表面レベル１Ｂ
からの深さはわずかに過ぎない。In particular, in the method of the present invention, the application of high-density heating energy starting from one end 4A of the region 4 is applied to the other end 4A of the region 4.
B, that is, the process ends at the position of the protrusion 7. At this time, a crater 6 is generated at the processing end position as shown in FIG. shallower than the surface level 1B of the metal base material, or even if it is deeper than the metal base material surface level 1B, the base material surface level 1B
The depth is only a little.
上述のようにして再凝固層９が形成された段階では、そ
の再凝固層９の表面には凹凸が存在するから、その後第
１図（Ｄ）に示すように仕上加工を行なって再凝固＠９
の表面をその周囲の表面をも含めて削り取る。この際、
突起部７の部分も併せて削り取る。このような仕上加工
を行なうことによって、突起部７に存在していたクレー
タ６は容易に除去され、平坦な仕上加工面１Ａが得られ
る。すなわち既に述へたようにクレータ６の最も深い部
分も金属基材１の表面レベル１Ｂより浅いかまたはそれ
より深くても基材表面レベル１Ｂからの深さはわずかで
あるから、基材表面レベル１Ｂからの仕上加工深さ（削
り代）ｄを一般的な仕上加工の場合と同程度（通常は２
＃程度）としても、クレータ６を充分に除去することか
できる。At the stage where the resolidified layer 9 is formed as described above, there are irregularities on the surface of the resolidified layer 9, so finishing is then performed as shown in FIG. 1(D) to form the resolidified layer 9. 9
Scrape off the surface of the object, including the surrounding surface. On this occasion,
The protruding portion 7 is also scraped off. By performing such a finishing process, the crater 6 existing on the protrusion 7 can be easily removed, and a flat finished surface 1A can be obtained. That is, as already mentioned, the deepest part of the crater 6 is also shallower than the surface level 1B of the metal base material 1, or even if it is deeper than that, the depth from the base material surface level 1B is small, so that the deepest part of the crater 6 is at the base material surface level. The finishing machining depth (cutting allowance) d from 1B is about the same as for general finishing machining (usually 2
# degree), the crater 6 can be sufficiently removed.
なおここで一般にクレータ６の深さは１．５ｍ±０．５
ｍＮ度であり、したがって突起部７の高さは２Ｍ程度と
することが望ましい。また突起部７を形成する部分の面
積は、要は形成されるクレータ６よりも大きければ良い
。Note that the depth of the crater 6 is generally 1.5 m ± 0.5
Therefore, the height of the protrusion 7 is preferably about 2M. Moreover, the area of the portion where the protrusion 7 is formed need only be larger than the crater 6 to be formed.
なお以上の説明では高密度加熱エネルギとしてＴＩＧア
ークを用いる場合について説明したが、レーザビームや
電子ビーム、プラズマア゛−り等を使用する場合も同様
である。In the above description, the case where a TIG arc is used as the high-density heating energy is explained, but the same applies to the case where a laser beam, an electron beam, a plasma beam, etc. are used.
実施例
ＪＩＳ ＡＣ２Ｂ合金からなるアルミニウム合金製デ
ィーゼルエンジン機関用シリンダヘッド粗形材について
、次のようにこの発明の方法による再溶融処理を？１な
った。すなわち、第２図、第３図に示すようにシリンダ
ヘッド粗形材におけるインテークボート１１とエキゾー
ストボート１２との間の弁間部１３に、ＴＩＧアークに
よる再溶融処理を施すにあたって、ＴＩＧアークの移動
軌跡を矢印１４で示すように定めておき、処理終端部と
なるべき部分に、予め突起部７を形成しておいた。この
突起部７は、直径１８履、高さ２Ｍのものであり、シリ
ンダヘッド粗形材の鋳造時に鋳型に凹部を設けておくこ
とにより形成しておいた。そしてＴＩＧアークを前述の
軌跡１４にしたがって移動させることにより弁間部１３
の再溶融処理を行ない、突起部７の位置で処理を終了さ
せた。ここで、ＴＩＧアークによる再？ＷＦＩＡ処理の
条件は、３．２＃径のタングステン電極棒を用い、シー
ルドガスとしてアルゴンガスを２５１／ｍｌｎ？ｆｆｌ
し、アーク電流はピーク電流を２１０Ａ、ベース電流を
１８０Ａとし、トーチ移動速度を０．７５ ｒｒｒｔｒ
ｔ／ Ｓｅｃとして行なった。Example: A cylinder head rough section for a diesel engine made of an aluminum alloy made of JIS AC2B alloy was remelted by the method of the present invention as follows. It became 1. That is, as shown in FIGS. 2 and 3, when performing remelting treatment using a TIG arc on the valve space 13 between the intake boat 11 and the exhaust boat 12 in the cylinder head rough section, the movement of the TIG arc is performed. A trajectory was determined as shown by an arrow 14, and a protrusion 7 was formed in advance at a portion that was to be the processing end. This protrusion 7 had a diameter of 18 mm and a height of 2M, and was formed by providing a recess in the mold during casting of the cylinder head rough section. Then, by moving the TIG arc according to the above-mentioned trajectory 14, the intervalve part 13
A remelting process was performed, and the process was completed at the position of the protrusion 7. Here, again by TIG arc? The conditions for the WFIA treatment are as follows: A tungsten electrode rod with a diameter of 3.2# is used, and argon gas is used as a shield gas at 251/mln? ffl
The arc current has a peak current of 210A, a base current of 180A, and a torch movement speed of 0.75 rrrtr.
It was carried out as t/Sec.
このような再溶融処理によって形成された再凝固層にお
いては、処理終端部の突起部７内に１．５Ｍ±０．５闇
の深さのクレータが形成されたか、粗形材削り代２ｍ（
突起部７での削り代４Ｍ）にて仕上加工を行なうことに
よってクレータが存在しない仕上加工面を得ることがで
き、したがって外観不良が生じないとともに、クレータ
の残存によってその部分の機械的特性が低下することも
防止できた。In the resolidified layer formed by such a remelting process, a crater with a depth of 1.5M±0.5 was formed inside the protrusion 7 at the end of the process, or a rough profile cutting allowance of 2m (
By performing finishing with a machining allowance of 4M) at the protrusion 7, it is possible to obtain a finished surface with no craters, and therefore no appearance defects occur, and the remaining craters deteriorate the mechanical properties of that part. This could also be prevented.
発明の効果
この発明の方法によれば、金属基材の表面層の改質のた
めに高密度加熱エネルギを用いた再溶融処理を行なうに
あたって、処理終端部となるべき部分に予め突起部を形
成しておくことによって、処理終端部に生じるクレータ
を通常の仕上ＦＪＯ工によって容易かつ充分に除去する
ことができ、したかってクレータの残存によって製品の
外観不良を招くことが防止されるとともに、クレータ内
の凹凸による疲労特性や衝撃特性の低下を招くことも防
止できる。Effects of the Invention According to the method of the present invention, when performing remelting treatment using high-density heating energy to modify the surface layer of a metal base material, a protrusion is formed in advance at a portion that should be the end of the treatment. By doing so, the craters that occur at the end of the process can be easily and sufficiently removed by the normal finishing FJO process, thereby preventing the remaining craters from causing poor appearance of the product, and also preventing the craters from remaining inside. It is also possible to prevent deterioration of fatigue properties and impact properties due to unevenness.
第１図（Ａ）〜（Ｄ）はこの発明の再溶融処理方法の一
例を段階的に示す模式的な断面図、第２図はこの発明の
実施例で使用したシリンダヘッドの要部を示す底面図、
第３図は第２図の■−■線における断面図、第４図（Ａ
）〜（Ｃ）は従来の再溶融処理方法の一例を段階的に示
す模式的な断面図である。
１・・・金属基材、 ２・・・ＴＩＧアーク用トーチ、
３・・・高密度加熱エネルギとしてのＴＩＧアーク、４
・・・処理すべき領域、 ４Ｂ・・・処理終端部、 ６
・・・クレータ、 ７・・・突起部、 ９・・・再凝固
層。
出願人 トヨタ自動車株式会社Figures 1 (A) to (D) are schematic sectional views showing step-by-step an example of the remelting treatment method of this invention, and Figure 2 shows the main parts of a cylinder head used in an embodiment of this invention. bottom view,
Figure 3 is a sectional view taken along the line ■-■ in Figure 2, and Figure 4 (A
) to (C) are schematic cross-sectional views showing step-by-step an example of a conventional remelting treatment method. 1... Metal base material, 2... TIG arc torch,
3... TIG arc as high-density heating energy, 4
...Area to be processed, 4B...Processing end portion, 6
... Crater, 7... Protrusion, 9... Resolidified layer. Applicant Toyota Motor Corporation
Claims (1)
層を再溶融させ、引続く急冷凝固により表面層を改質さ
せる金属表面の再溶融処理方法において、 高密度加熱エネルギの印加位置を金属基材表面のある領
域にわたって連続的に移動させてその領域を処理するに
あたり、処理終端部となるべき部分の金属基材表面に予
め突起部を形成しておき、その突起部の位置で処理を終
了させることを特徴とする金属表面の再溶融処理方法。[Claims] A method for remelting a metal surface, in which high-density heating energy is applied to the surface of a metal base material to remelt the surface layer, and the surface layer is modified by subsequent rapid solidification, comprising: When the energy application position is continuously moved over a certain area on the surface of a metal base material to treat that area, a protrusion is formed in advance on the surface of the metal base material at the part that should be the end of the process, and the protrusion is A method for remelting a metal surface, characterized in that the treatment is terminated at a certain point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62155196A JPH062897B2 (en) | 1987-06-22 | 1987-06-22 | Method for remelting metal surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62155196A JPH062897B2 (en) | 1987-06-22 | 1987-06-22 | Method for remelting metal surface |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPH01218A true JPH01218A (en) | 1989-01-05 |
| JPS64218A JPS64218A (en) | 1989-01-05 |
| JPH062897B2 JPH062897B2 (en) | 1994-01-12 |
Family
ID=15600596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62155196A Expired - Lifetime JPH062897B2 (en) | 1987-06-22 | 1987-06-22 | Method for remelting metal surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062897B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146284B1 (en) * | 1983-11-29 | 1988-06-29 | Sony Corporation | Methods of manufacturing dielectric metal titanates |
| JPH01142063A (en) * | 1987-11-30 | 1989-06-02 | Isuzu Motors Ltd | Treatment of metallic surface |
| JP4952390B2 (en) * | 2007-06-15 | 2012-06-13 | 株式会社Ｊｖｃケンウッド | Waterproof structure of rubber key for switch operation of portable electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110720A (en) * | 1984-11-05 | 1986-05-29 | Honda Motor Co Ltd | Remelting and hardening treating method of shaft-shaped member |
-
1987
- 1987-06-22 JP JP62155196A patent/JPH062897B2/en not_active Expired - Lifetime
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